Core functions

  • Supports standard Internet mail protocolos: POP3, IMAP, SMTP; as well as Microsoft’s EWS protocol for Exchange.
  • Main window shows all folders selected for synchronization at a glance.
  • Messages are loaded one “page” at a time as needed, scroll to bottom to load more.
  • Supports GMail – like way of working with email, when old messages are never deleted from the server.
  • Mail check time is independent of the number of messages (my Gmail account has over 100,000).
  • Supports viewing plain text and rich text messages, including embedded images.
  • Supports rich text formatting when composing messages including the signature (bold/italic/underline, font size, font color, embedded images, typeface).
  • Fast attachment loading, attachment cache.
  • Flexible mail check scheduling.
  • Sound, LED, vibration notifications for new mail and errors. Per account notification options.
  • Silent mode for nights and weekends.
  • Preloads new message text and attachments (up to specified limits) when checking mail. Full message text is loaded on demand, when a message is viewed.
  • Can load full message text and attachments if put into background (pressing the Home key).
  • Support for SSL and TLS encryption.
  • A home screen widget with unread / total message counts that can be set to an account or a specific folder, and a message list widget. Both have several built-in themes.
  • Separate settings for WiFi vs. mobile network (including a separate outgoing mail server setting for WiFi, if needed).
  • IMAP: IDLE (push email), instant incoming message notifications (if supported by the server).
  • IMAP and EWS: messages can be moved between folders.
  • Smart Folder for quickly browsing messages that might need attention.
  • Per-folder color indicators.
  • Message navigation without leaving the message view (two variations on swiping).
  • Swipe actions in message list.
  • Swipe navigation between messages.
  • Android Wear smart watch support.
  • Calendar sync for Exchange accounts.
  • Push mail for Exchange accounts (Pro version only).
  • Contact sync for Exchange accounts.
  • Message grouping (conversations).

How can I delete messages in AquaMail without deleting them from the server?

Each account has a setting for the default way to delete messages. The initial setting is “move to deleted first, delete from server when purging the deleted folder”.

To change the default: long press on the account in the main screen and choose “Options and Folders”, then “Account options”.

Tap “Deleting messages” and choose “Hide in the app, keep on the server”.

This will change the default action icon for deleting messages from this account to “hide”.

Hidden messages can be restored by using the menu in the message list view. They will be also automatically deleted from the app at a later point to reclaim storage space.

Note that it’s not really necessary to delete messages from the app — old messages are automatically deleted over time without affecting the server, keeping storage usage under control. The default is to keep 250 most recent messages per folder (and can be changed in each account’s Folders and Options as “messages to cache”).

How do I access server side folders?

This is only possible with IMAP or EWS (POP3 does not support access to individual folders).

There are two ways to access folders from AquaMail: on an “as needed” basis, or by setting certain folders to sync (keeping them up to date, just like the Inbox).

“As needed”: Start from the title bar or the side bar of any other folder’s message list, there is an item labeled “Other folders…”. This item is also present when moving messages between folders, and also, on tablet sized devices, in the account list.

When accessing folders this way, recently accessed ones will be shown in the folder view (dropdown or side bar) and the account list. They are removed from the recent list automatically, over time, or you can long press on a “recent” folder to clear it. To change how long the app keeps recent folders and how many, please see app settings -> account list.

To enable or disable the “Other folders…” entry in the account list, please long press on an account, choose “Options and Folders”, then “Account options”, scroll to the end and enable “Show Other folders…”.

“Setting to sync”: You can set any folder or folders to sync (every time the app checks mail in the account), which will also make it always visible in the account list (“main window”) for easy access.

Long press on the account in the main window, choose “Options and folders”, then “Folders”. Or choose “Manage folders…” next to where “Other folders…” was. Tap a folder, choose how it should be synced (most likely “Sync, plain folder”).

To clear a folder’s “set to sync” setting, go back to this screen and choose “Do not sync” for a folder you don’t need to be kept up to date all the time.

There is a “+” icon on this screen (“Manage folders…”) to create a server folder.

If you delete any folders that are set to sync in the app (using web mail, or another mail app), please bring up Account Options / Folders in Aqua Mail to sync its folder list with the server.

How to change the order of accounts in the main window?

To move an account within the list, long press on it, then choose “Change order” from the popup menu.

Enabling message zooming and auto-fit

To access this feature, please go to Settings>Message view and enable Browser-like zoom and Auto-fit.

When viewing or composing email, the font is too small?

While viewing or writing email, adjust the font size using the volume keys. The setting is remembered, so if done accidentally, you might need to readjust the font.

Or you can use Menu -> View -> Smaller / Larger font.

In two-panel mode (on tablets), this is how you can adjust font size for the account list (left panel) while the volume buttons go to the right panel (message list).

Also on tablets, the Menu that refers to the left panel in two panel mode is going to be the famous “three dots icon” in the app’s “action bar” (top right corner of the screen).

What is the Smart Folder?

The Smart Folder shows messages which, over a selectable time period:
1) were sent (this is the date/time in the header);
2) were read, including read in other apps (for IMAP).
3) or are unread, no matter what their date/time is.

You can also include starred messages in this list, please see app settings under Smart Folder or the navigation drawer (side panel) in the smart folder’s message list view.

In other words, this is the list of messages that might require attention, or that you might need to come back to. This folder is enabled by default, but can be disabled in the app’s settings.

Per-folder color labels are also enabled by default, but can be disabled in settings.

To assign a folder a different color, or to set whether it’s included in the the Smart Folder, please do this:
1) long-press the account in the main window
2) choose “Options and folders”, then “Folders”
3) scroll to whichever folder you wish to change 4) long-press the folder or tap the settings icon to the right of the folder’s name

Why is there star between the unread count and the total count for some folders?

A folder is marked with a star (e.g. “3 * 100”) when it contains new, just received, messages. Viewing the folder’s message list resets the star. This lets one keep track of which folders need attention.

How do I enable Push mail?

Push must be enabled (configured) in 3 places:
(1) for the entire app,
(2) for the specific account
(3) for the specific folder(s).

Given the app’s default settings, usually only step (2) is necessary to enable push mail for an account.

(1) For the entire app: This is enabled by default, but please see app settings -> mail, receiving.

(2) For the account: This is off by default.
Long press on the account in the main window (account list) and choose “Options and Folders”, then “Account options” and you’ll see it.

(3) For the folder(s): This is enabled by default for the main Inbox folder, but is disabled for other folders.

Long press on the account in the main window (account list) and choose “Options and Folders”, then “Folders”.

Find the Inbox (or whatever other folder), tap the folder name and set it “to sync”, then tap the gears (settings) icon on the right or long press on the folder name.

You’ll see a popup window with options specific to this folder, including push mail.

Notification icon in IMAP Push mode

This is required by Android for apps that need to stay in the background for extended periods of time, to avoid being “killed” by the system. You definitely would not want that for push email.

There is way to remove the notification in the app’s settings (the setting is under “Look and Feel”). When the notification disabled, the app will use its own tricks to stay in memory and avoid getting killed.

Can I make the app start in the Smart Inbox or some other folder?

Please see the app’s settings, then look under “Look and Feel”, the setting is called “Start the app in…”.

How can I see the full list of message recipients?

When viewing a message, tapping on the header switches between brief and full header modes.

The full mode shows all message recipients, while the brief mode is optimized to be just two lines tall.

Is there a spell checker?

On Android 4, the app can use the spell checker built into the system. You can enable it in the device’s system settings, under Languages and Input. Once this is done, spell checking will be automatically enabled in the compose area.

If the setting is not there – the feature must have been removed by your Android device manufacturer from their flavor of Android system software. I can’t find it on my Samsung phones (but it’s there, as expected, on a Sony and an HTC).

Swiping between messages

With the default settings, you can swipe between messages.

Optionally, if you turn off app settings -> swiping -> “between messages”, then it’s also possible by swiping on the message headers.

Please see app settings -> message view to change whether “previous” / “next” mean “older” or “newer”.

Finally, when swiping through a message thread (group), the app skips the older messages. If you’d like for swiping to iterate through all messages in a thread, new or old, please see app settings -> conversations -> turn off “smart message navigation”

Printing messages

Use Menu -> Copy/Send/Share/Print -> Send/Share/Print message text when you have a message open. Then choose your printing app from the app selection window (i.e. where to “send” message text).

A variety of printing apps is supported, but I especially recommend Cloud Print by Paolo Fernandes, which can print formatted messages, including images.

Setting a signature

This is a per-account (not app-level) setting, so that each account can have a different signature (corporate / personal / etc.)

1) long-press an account in the main window
2) choose “Options and folders”, then “Composing and Sending”
3) The signature setting is on the next screen.

Setting a BCC to self

This is a per-account (not app-level) setting:

1) long-press an account in the main window
2) choose “Options and folders”, then “Composing and Sending”
3) The “BCC to self” setting is on the next screen.

Can I exclude a particular account from scheduled mail checks, without having to delete it?

Long press on the account name in the main window – choose “Options and folders” – then “Account options” – clear “Scheduled sync” and “Enable IMAP Push”.

Changing an account's password in the app

Long press on the account (in the account list), choose “Account setup”, enter the new password, press Next.

When composing a new message, not all accounts are available in the account list

Most likely, some accounts don’t have an outgoing mail server configured.

Long press on the account name in the main window – choose “Account setup”, then “Manual”, “Next”, and make sure there is an outgoing server configured.

Requesting a 'read receipt'

The app supports requesting a “read receipt” when composing messages. This is in the menu.

Note that not all apps support read receipts on the receiving side. My app does not (yet), and neither do Gmail (Android or web), iPhone Mail (as reported by a user), built-in Android Email (the stock one from Google, manufacturer-enhanced versions may differ).

Moving messages into spam folder

The app supports an easy way of moving spam into the server’s spam folder (for IMAP accounts only, as POP3 does not provide server folder access).

1 – Long press on the account, choose “Options and Folders” then “Folders”
2 – Scroll down to the server’s Spam folder (for Gmail, that’s “[Gmail]/Spam”).
3 – Tap the spam folder, choose “Sync as spam” or “Spam, do not sync”.

Now the menus in message list mode (when one or more messages are selected) and message viewing mode will have an item to move message(s) to spam.

How can I disable scheduled mail checking in the background?

Please see the app’s settings, under “Receiving mail”: “Scheduled mail checking” and/or “Enable IMAP Push”.

How can I change account type between IMAP and POP3?

An account’s type (POP3 / IMAP) cannot be changed once the account’s been set up.

Is there a way to save sent messages on the server?

Yes, the app can upload sent messages to an IMAP folder. There is also a setting for “BCC to self”.

For most IMAP servers, this should be configured automatically. If it was, you should see a color “label” on the left side of the account’s “[ Sent ]” folder in the account list.

To configure manually:
1) long-press the account in the main window
2) choose “Options and folders” then “Folders”, tap the server’s sent folder, choose “Sync with [ Sent ]”.

Why are messages loaded using POP3 not marked as read on the server?

POP3 has no support for marking messages as read or unread. Some mail services mark messages as read once they’ve been downloaded by a mail application, some do not.

Why are messages loaded using IMAP get marked as read all by themselves?

Can happen if you mix IMAP (in Aqua Mail) with POP3 (in another mail app, say Outlook for Windows).

POP3 has no support for marking messages as read or unread. Some mail services mark messages as read once they’ve been downloaded by a mail application, some do not.

IMAP does have support for syncing the read/unread per-message state.

So what can happens is:
– a new message arrives, is initially unread;
– when it’s retrieved with Outlook for Windows (let’s say) over POP3, the mail service will mark the message as read;
– since POP3 has no read/unread sync, the message will remain unread in Outlook;
– but since it’ll be marked read on the mail server, and IMAP (in Aqua Mail) does have read/unread sync, the message will show as read in Aqua Mail.

Solution: don’t mix POP3 and IMAP. The best way to access an account from multiple email apps is to use IMAP in all of them.

Unread message counter on the app's icon (badge)

Android provides no way to do this that’s 1) standard 2) accessible to third party apps.

And yet, AquaMail does this on recent Sony, Samsung and LG devices (+ ASUS and Huawei added recently), in the manufacturer’s standard launcher, by using unofficial, undocumented functions intended for apps built into the phone.

Please see app settings under “message notifications”.

There are two more options: 

  • Using AquaMail’s “message counter” widget. The widget has four visual themes and can be configured to “point to” a specific account or a folder. You can find it in the same place as all other widgets, please start by long pressing on an empty spot on the home screen.
  • Switching to a third party launcher that has this capability. Apex Launcher Pro (you will need to enable “External notifiers” in its settings, under Advanced) Nova Launcher Prime (you’ll need to install Tesla Unread, no other configuration is necessary) Smart Launcher (you’ll need to install Smart Launcher Notifications).

Can I send any attachment type or just pictures?

The application can send any type of file attachment. In order to attach something other than an Gallery image, please install a file manager.

Shrinking (resizing) large images (photos) when sending

  • App settings -> Composing and Sending -> Shrink large images when sending – Bring up the above screen at least once to enable the feature, and optionally, select a default “target size” which will be applied immediately when you attach an image. The “large” target size is probably what you’ll want: large enough for computer monitors, and yet producing reasonable file sizes.
  • On the compose screen, you will see original and estimated shrunk file sizes, like this: “Foo.jpg 5.2 MB ( ~ 1.4 MB )”, where “5.2 MB” (megabytes) is the original file size, and “~ 1.4 MB” is the estimated shrunken file size.

  • You can use Menu -> Shrink images on the compose screen to adjust the already attached images.
  1. Works on JPEG format images.
  2. Availability varies with phone hardware, most modern phones / tablets should be OK.

How does the application load attachments?

Attachments are downloaded into the specified folder (by default, /download) as needed. This folder is under your full control, you can remove unneeded files at any time.

When using POP3, attachments are also saved into a hidden folder on the phone’s “large built-in storage” during scheduled mail checking, this is called caching. A cached attachment will be moved into the “/download” folder without having to download it from the server.

When using IMAP, attachments are loaded as needed. There is a setting under account options to preload and cache attachments up to a specified limit (set per message).

Cannot save attachments on the external sdcard

In Android 4.4, Google made a deliberate change that prevents third party applications from saving data on the “real” (external) memory card, on devices that also have a large built-in storage (like a memory card, but built in).

The change affects all third party applications, and there is no way around it – it’s a system policy, and, to reiterate, a deliberate change.

Caching attachments on the external sdcard (microSd)

It’s possible to “cache” attachments on the real microSd card if the phone runs Android 5.0 or higher.

Caching is where attachment files are stored after they’ve been fetched to the phone, just tapping an attachment for viewing does not move the attachment from the cache (this only happens when you use three dots menu to “save” an attachment).

So by and large, the majority of your attachment files, in the normal course of using the app, are “cached”.

To set this “cache” to use the real microSd card, please see app settings -> look and feel -> “Folder for caching attachments” -> set to “On the memory card”.

If this item is not present, then most likely the phone does not have a microSd card or it cannot be accessed in a standard way.

Why does Aqua resize images inserted into formatted text?

First, they’re not meant to be used for photos and such. That’s what attachments are for.

Second, we ran into an issue in the Android text editor (which my rich text editor is built upon): it doesn’t render any embedded images wider than the screen.

How can I limit the amount of used traffic when there are large incoming messages?

There are settings for how much new message text is loaded when the application performs scheduled background mail checking.

You can also limit automatic message loading that’s triggered when viewing an previously incompletely loaded message.

There are separate settings for WiFi vs. cellular data connection.

Messages out of order, or wrong message dates

If the app is not downloading most recent messages from an IMAP account:


This can happen if you uploaded a lot of messages using a desktop mail app, maybe when migrating to a new mail provider, or moved a lot of messages to a new folder.

Can also be caused by a server bug, since IMAP guarantees ordering by date for incoming mail.

Version 1.4+ has a new per-account setting that lets you specify how many messages to sync by a date range, rather than by the number of messages. This works even in the above scenarios.

To use this setting: long press on the account -> options and folders -> account options, and change the “Messages to sync” setting (formerly called “Messages per page”) from a number based value (like “25” or “50”) to a date range based value (like “7 days” or “14 days”).

For migrated accounts, if you’ve uploaded your messages, some IMAP mail servers will then report the date/time when you did this as the date/time stamp for all messages.

If you’re seeing this, please delete the account in Aqua, add it back, and before it syncs any messages, open the account’s options and folders -> IMAP options, and change “which message date/time to download” to “Date/time sent (from message header)”.

App not fetching all recent messages from Hotmail

Symptoms: a Hotmail account shows a few very recent messages, and then there is a large “gap” to 2013 or something.

A known issue that seems to come up pretty often in @hotmail / @outlook accounts.

I guess it’s their ongoing “migration to new servers”.

Please try this:

– Long press on the account -> options and folders -> account options.
– Change the “messages to sync” setting from a number based value (“25 messages” etc.) to a date range based value (“last 7 days”, etc.) ( You can refer to the previous FAQ entry just above for screenshots. The part after the screenshot there does not apply. )
– Back out and refresh the account

The number of messages in a folder is suddenly zero, but there are messages in it

For a POP3 account, you might have checked email in a program that’s set to remove downloaded messages from the server. AquaMail displays the number of messages on the server, so seeing a zero is normal in this case.

What is the largest message I can send?

Most mail servers limit message size to about 30-40 megabytes. Considering that attachments are base64 encoded, this means about 25-30 megabytes per message.

What does the 'WiFi in sleep mode' setting do?

A phone or a tablet is can be set to disable WiFi when the screen is off to save battery.

When this setting is on, AquaMail will enable WiFi and try to connect to a WiFi network when waking up for scheduled background mail checks.

How can I make a backup of my mail accounts?

Please use the Menu on the app’s main window and choose “Backup and Restore”. You can back up your account and folder settings, and optionally include the app’s settings.

The backup file is encrypted with a password (of your choosing) which will be required to restore.

The app lets you easily upload / download the backup file to / from cloud based storage (Google Drive, OneDrive, Box.com, Dropbox) and then restore from there. Or you can copy the file yourself, it’s under “backup/AquaMail” on the phone’s “large built-in storage”.

Please note that actual messages are not archived or restored. The app will re-sync them from the mail server(s).


Since app version 1.17, "backup and restore" is in app settings -> Storage.

Entering and picking emails (contacts)

AquaMail integrates with the device’s Contacts/People application (which is in turn synced with your device’s @gmail.com account(s) and other accounts you may have configured, such as Google+).

The app will display a drop-down list of matching contacts as you enter them in any of the recipient entry fields (after two characters), matching on names and emails.

You can also press the contact picking button to the left of each recipient entry field to bring up the app’s own contact picker. The built-in contact picker filters contacts by email, has search, and a group tab where you can pick a whole group or individual group members.

It also has a “recents” tab which shows email addresses from recent messages, regardless of their existence in the device’s Contacts/People app, and an Exchange tab (for Exchange accounts) also with search.

It’s also possible to use the system contact picker using the respective entry in the Menu when composing a message (or making it permanent in the app’s settings under Contacts) Since version 1.6.0, the app offers Exchange contacts (from the selected account) in auto-completion (enabled by default, can be disabled by long pressing on the account on the app’s main screen -> Exchange options).

The app can also offer actual recent emails (not saved in Contacts) in auto-completion (disabled by default, can be enable in app settings -> Contacts).

Saving mail recipients (contacts)

You can save any already entered names/emails when composing a message by long pressing on the contact picking button to the left of the respective entry field. You’ll be prompted for which one to save if there are several.

Also, AquaMail can automatically save all your outgoing mail recipients in the device’s Contact list. This is disabled by default, you can enable it in the app’s settings under Contacts.

When enabled, AquaMail will add all outgoing mail recipients to a separate group, “AquaMail”, which will be created in your device’s primary Google account.

Accessing recent email recipients

The built-in contact picker (a button to the left of each recipient entry field) has a tab with “recents” — email addresses used in a certain number of recent messages, both incoming and outgoing, even if those addresses don’t exist in the Contacts / People app.

This list is built from actual recent messages. When all messages with a particular address have been removed from the device, the address will disappear from the contact picker’s recent list as well.

You can also enable “recents” right in the auto-complete when entering addresses, which will make it unnecessary to bring up the contact picker window. That’s in app settings -> Contacts.

Sending messages to a group

1. Tap a contact picking button to the left of the respective address entry field. In the app’s built-in contact picker that comes up, swipe to the Groups tab, and either select one and all its contacts, or expand and select some of them.

2. Create a dummy contact with a list of email addresses, separated by commas. The app will expand the list and add each email as a separate item. As far as I know, K-9 works the same way.

3. Open the device’s Contacts/People app, open a group, use the menu / buttons / etc. to “Send email”, then choose Aqua Mail from the offered list of apps. Works on stock Android, some manufacturers remove this function.

Where does AquaMail store its messages?

Messages are stored in a database in the device’s internal memory.

Attachments are cached in “large built-in memory” (the one that’s 16GB, 32GB etc.) or since 1.6.2 this can be on real microSd the memory card (Android 5.0+).

How long are old messages stored on the device? How can I delete them?

Usually, old messages are deleted automatically, each folder keeping the most recent 250 messages.

You can specify a different setting in a particular account’s “Options and folders”, either for the entire account, or for a specific folder (use the settings icon on the right side of a folder’s name).

You can also compact the message store deleting old messages by using the menu in the main window.

Can I move AquaMail to the memory card?

No, for a variety of reasons: performance, reliability, security, Android documentation.

Some non-official firmwares will let you move AquaMail to the memory card even through it’s disallowed by the application. This may or may not work, and is not a supported configuration, but you are welcome to try, if so inclined.

New account setup - manual or automatic?

There are two ways to set up a new account: manual and automatic.

Pressing Next after entering your email and password will cause AquaMail to either apply presets for a certain number of popular email services, or to try to guess incoming and outgoing server names based on your email address. This works most of the time, but there may be exceptions requiring manual setup.

Pressing Manual in the account setup window lets you enter all server settings by hand, and the application will use them exactly as entered.

Not able to take screenshots of AquaMail (some error message about DRM)

This can happen if you’ve enabled app settings -> security -> PIN code / fingerprint.

When you do this, AquaMail marks its window as “secure” — to prevent its contents from showing in Android’s “recents apps” list (which anyone can see, even when the app itself is “locked”).

Regrettably, this also makes Android block the screenshot taking capability (even though it’s not the intention).

How can I specify an account as default for sending?

Starting with version, there is an app setting (under Composing and sending) to specify the default account/alias for new messages.

Other than that, AquaMail remembers the account most recently used for composing mail until the next time. You can always change the account for the current message using a popup/dropdown list.

Replying and forwarding offers to use the same account where the replied / forwarded message was received (can be changed with the drop-down, too).

Linked pictures (images) in incoming messages

With the default settings, the app will not show linked pictures (images) right away, because linked images are often used by spammers to track you.

There is a panel/button just between the message header and its text content. Tap it once to show images, tap again to save the sender’s address as “known” (safe) for future use. The panel/button has help prompts.

You can turn the whole feature off by pressing the settings icon on the right side of the panel, and disabling “Show only from known”.

There is a second level check for this, too – linked images are turned off for mobile data (and enabled for WiFi). You can change this on the same settings screen as in previous point.

The app's notifications are not showing

On Android 4.1 and above, please check the device’s system settings -> apps management -> AquaMail -> details -> make sure that “notifications” is checked (enabled).


This is a system level setting that my app doesn’t control. When off, it suppresses notifications for the respective app.

Apparently this setting has a mind of its own, and can magically become enabled (by the system). It also disables in-app toast messages, this was reported to Google just recently, in July of 2012 (</irony>).

'SSL certificate change', Gmail and others

You’ve enabled an AquaMail feature where it remembers the SSL certificate used by every mail server it connects to, and warns you if that certificate changes.


A change might indicate an MITM (Man in the middle) attack on your password, or may be a legitimate change made on the server.

This is in app settings under Network.

When you see this message, it’s you job as a user to:

1 – tap the message

2 – review if the change seems safe to you

3 – let the application know what you’ve decided, whether it can treat the new certificates as safe

To do this, tap the message, then review, tap a certificate, then click “OK”. The “Issued by” information is probably the most useful part here, that should help you decide.

On the other hand, if you get this message in a cafe / airport / carwash, and the new certificate looks suspicious — then it would be in your interest to *not* accept the change.

Gmail is notable in that Google changes its SSL certificates quite often (lately, once a week it seems), much more so than any other mail service.

In closing – if the application could make such choices itself, it would. If you find that the feature to track SSL cert changes is inconvenient, you can always turn it back off (which is the default).

Green or red 'lock' icon when viewing a message, DKIM and SPF

DKIM and SPF are technologies related to email transmission security.

A green lock tells you that the message you’re viewing was “signed” by the mail server on the sending side and the signature “passed verification” by the mail server on the receiving side (the one hosting your mail account).

In practical terms, it means that the message’s content has not changed while en route.

A red lock tells you that either DKIM or SPF “failed to validate”, so either the message’s content, as received, is not what was sent, or the sending party used a computer which is not “authorized” for sending messages from his/her email’s domain (e.g. a message ostensibly from “billg@microsoft.com” but coming from a computer that has nothing to do with Microsoft).

Even if you get a red lock, it does not necessarily mean that someone’s intentionally tampering those messages with malicious intent: the indicator is purely technical, it just means that your (receiving) mail server decided that the digital signature didn’t validate, could be due to a software bug on the sending or the receiving mail server(s).

Can be turned off in app settings -> message view -> “Show security info”.

Android 5+ and high battery use, 'mobile radio active'

A widespread issue in Android itself affecting a multitude of apps, at random, even Google’s own

Screenshots on the forum:


Discussions elsewhere on the Internet:


Bug report in the Android bug tracker, right now “starred” by over 3000 affected users, with screenshots of this issue in Gmail, Google Play Services, WhatsUp, Hangouts, Chrome, etc.:


Google promised that the bug would be fixed in Android 6 (but it does not seem to be, at least not fully, there are screenshots from Nexus 6P in that bug discussion).

Turning off Calendar and/or Contact sync for Exchange accounts

It’s a per-account setting.

Long press on your Exchange account -> options and folders -> Exchange options, and you’ll see it.

Archiving messages

Supported for IMAP / EWS accounts, not POP3

  1. Choose or create your archive folder:
  2. Long press on the account -> options and folders -> folders
  • For Gmail: use Gmail -> All Mail
  • For Fastmail, iCloud, maybe others: use pre-created Archive
  • For the rest: if there is no archive type folder, tap the “+” icon to create one 
  1. Tap the chosen folder, choose “Sync as Archive” or “Archive, don’t sync”
  2. Assign a swipe gesture for message lists, if wanted: app settings -> swiping -> scroll down to “message list”
  3. Assign notification icon, if wanted: app settings -> message notifications -> action icons. I recommend “Delete or archive, depending on the account” if some of your accounts will have “archive” and some won’t.

'Select All' function selects only one screen full of emails, instead of all

You can change the app’s logic in Settings -> Message list -> ‘Select “All” means’.

Messages to sync and messages to cache settings

Copied from the forum

So, does that mean that the number set as “to cache” is the number of messages kept on the device and available to be shown by AM?


Re: and available to be shown by AM


When you open a folder’s message list, the app shows the (usually) smaller number, “messages to sync” — those messages which are *known* to still exist on the server and in a known state (read/unread etc.)

The “messages to cache” comes into play if you scroll a folder’s message list down to “see more” — then the app can more quickly re-sync the next …. messages just by checking with the server for their existence and state (as opposed to full download).

Another way to see all those cached messages is to do menu -> view -> offline list (in message list view). This is done automatically if the device is in airplane mode.

Message filtering (rules)

Sorry no such feature in the app.

We believe that message filtering is best done right on the mail server (service):

– Most mail services have supported it for a decade if not longer (try “settings” after logging into your account on the mail provider’s web site).

– One place to set things up, vs. in each mail app

– Consistent between all mail apps (mobile / desktop / etc.)

– No additional setup if you get a new phone

Gmail specific: if you’re going to “move” messages, please also turn on “archive (skip inbox)” for each rule (you’ll see this while creating it) — without it, Gmail will *copy* not *move* the filtered messages.

App not checking mail (with specifics for Android 6+ Doze Mode, Samsung, Xiaomi MIUI, Huawei, ASUS)

In general, if the app is not checking mail (the default is once every 15 minutes), then the most common culprits are: – For Android 6.0 and newer, its so called Doze mode – Memory optimizer apps and battery optimizer apps (e.g. Clean Master) – Sometimes those are third party apps, sometimes built into the phone’s system software (Xiaomi, Huawei, possibly others) — Android 6 and newer and its “Doze Mode” Doze Mode is where Android will not let apps run in the background as often as they need to while the phone is stationary.

This kicks in after a few hours on Android 6 and sooner on Android 7.

The app will prompt you to “whitelist” (exclude) it from this “Doze Mode” within a day after installing if it detects Android 6 or newer.

To check, please bring up AquaMail settings -> mail, receiving.

If the app is not already whitelisted, there will be a green panel / button / message / prompt asking you to do this.

There are several “battery optimizer” apps (third party or things built into the phone’s software) which deliberately block the ability of apps to access the network or to work in the background.

One such app is Clean Master.

If you use one, please try to “exclude” or “whitelist” AquaMail there.

On Samsung phones please see Phone Settings -> Device Maintenance -> Battery. You’ll want want the “power saving mode” to be OFF.

And below that, if you scroll down, you do not want Aqua Mail to be listed in “always sleeping apps”. You may want to put it under “unmonitored apps” so it stays out of harm’s way.

There were several reports recently specific to Xiaomi MIUI: Apparently MIUI has some sort of “battery optimizer” thing built-in – Which prevents apps from accessing the network when in the background – This is in the phone’s system Settings app -> Additional Settings -> Battery & Performance -> Manage apps battery usage Gmail and a few other apps are already whitelisted there. Not AquaMail though, so this has to be done manually.

Recent Huawei phones have a built-in “battery optimizer” too.

It’s in the phone’s Settings app -> Advanced settings -> Battery manager -> Protected apps -> and you will want to set AquaMail to “Protected” here.

ASUS phones too have a built-in “battery optimizer” called “mobile manager”.

The section you want there is labeled “auto-start manager” and Aqua Mail needs to be set to “allow”.

Cannot send emails when device is connected to WiFi (connect / network errors)

If the WiFi in question is something at a hotel, McDonalds, etc. – public WiFi access points are often limited to web browsing traffic and block everything else.

Same often applies to office WiFi networks (corporate IT policies).

Push mail for Exchange - "messages to sync" has to be "date based"

Push mail for Exchange requires the “messages to sync” in that account to be set to a “date range” type value. The initial value when you add an Exchange account into the app is “21 days”.

Has to do with the technology that we use for push mail for Exchange.

Changing the “messages to sync” in an Exchange account to a “number” type value (e.g. “50 messages”) will turn off the “push mail” setting. Turning “push mail” back on will change the “messages to sync” to “21 days”.

With IMAP accounts, the technology is completely different, and there is no such requirement. In fact, for IMAP, sync by “message count” has somewhat better performance.

Unread badge on the app icon - Samsung with Android 8.0 (Oreo)

Starting with Android 8.0 (Oreo) Samsung completely changed how the “unread badge” feature works. Previously an app could directly set the badge’s value, this is not longer possible. At all.

The “new way” is managed by the phone’s software and its value is automatically taken from the app’s notifications (in the phone’s top bar).

There are two settings to check / adjust before this works.

1 – Phone settings -> Apps -> Aqua Mail -> Notifications -> enable “Show bagde”.

This however will only trigger on single-message notification, so you’ll have either nothing or a “1” on the badge.

To make it work for multiple-message notifications, please:

2 – Aqua Mail settings -> message notifications -> enable “Smart Watch enhancements”.

This also changes how on-phone notifications look. You’ll be able to expand (swipe down) on a notification that’s “about” more than one message, turning into individual “cards”, one per message, each with its own action buttons (mark read and so on).

This “enhanced” notification style – which first appeared in Android 7.0 – works with the new Samsung badge feature as expected, even when there are multiple unread messages.

PS – the badge count will clear when the app’s notifications are cleared.

PPS - there are some reports of badge count being wrong, e.g. showing 21 or something when only 1 - 2 emails are unread.

Seems to be a problem with Samsung software which can affect other apps too (not specific to Aqua).

Unread badge on the app icon - Samsung with Android 9.0 (Pie)

Starting with Samsung's 9.0 update, the badge doesn't show and cannot be made to show because of another change made by Samsung.

Detailed info is available on our forum.

New text editor in version 1.14

Version 1.14 has a new text editor (on the compose screen) with these new features suggested by users:

  •  Lists (with bullets or numbers)
  •  Paragraph alignment (left / center / right)
  •  When replying, editing the “original” preserves all formatting, even images

This new editor cannot have a black background for technical reasons, so in the dark theme we made the background a “muted” light gray (the light themes use pure white).

When replying or forwarding, the original message is shown as “( … )”

If you just type your new text and tap Send, the original message will be inserted where the “( … )” placeholder was.

To delete the original message just put the cursor on the next line and tap Backspace on the soft keyboard – i.e. this works just like deleting text.

To “expand” the original message for editing just tap the “( … )”. This will keep all the formatting of the original and it’ll be editable as well.

If you prefer the old editor, the new editor can be turned off in app settings -> composing and sending.

Showing per-folder "total" counts

The app's main screen (list of accounts and folders) received a design update in version 1.16.

As part of this design update, per-folder "total" counts are hidden by default, and only unread counts are visible.

You can restore how things worked before by using app settings -> account list -> show per-folder "total" counts.

Inserting your own HTML code into signature

This was added in version 1.16.

Requirements: Android 5.0 or newer, app settings -> composing and sending -> use new editor turned on (is the default).

This feature lets you use your own "pre-cooked" HTML code in signature settings.

To use this, first switch the account's signature editor window into formatted text mode if not already done so. There is a button / panel for it above the text input area.

Second, just paste your HTML code into the editor. You should see the "content" of your HTML code with formatting, images, and whatever you have there - and not the "raw" HTML code itself.

If it fails and you see "raw" HTML code instead - please be sure that your HTML code (snippet) is well-formed.

We check for a valid HTML opening tag (with or without attributes) at the beginning and a valid HTML closing tag at the end. The two tags need not be the same.

Notification appearance settings - Android 8.0 and newer

Per Google requirements, notification "appearance" settings are now in Phone Settings, provided by Android. This applies to Android 8.0 and newer and Aqua Mail 1.18 and newer.

It's the same in all or nearly all apps (definitely Gmail, Twitter, others which had recent updates).

Phone Settings have options for sound, vibration on/off.

There is no option for LED color (Google forgot, manufacturers don't seem to care).

There is no option for vibration pattern.

Some phones don't have an option for LED on/off. Some phones don't have an option to choose a particular sound, only on/off, using the "global" notification sound setting (which can be changed, but will affect all modern apps).

On some phones the LED will only flash if there is a sound or vibration (doesn't make sense to me, but this is Google). Some phones have a well hidden setting to "pulse the LED", some do not.

All this mess is completely out of our control. Notification appearance settings are now provided by Android (and can vary from device to device) and cannot be overriden by apps.

Google is strong-arming developers into this, it's not optional (if an app does not opt into the new scheme - it's not possible to release updates to Play since November 1, 2018... and we do want to).

If your phone is missing some options (e.g. a way to choose a sound) or some of them don't work - please contact your phone manufacturer's support and let them know. Them and Google are the only ones who can fix this.

How interested they are is another matter, but there is hope since this affects all apps now, and your phone manufacturer can fix this in "their" Android "flavor" wihtout waiting for Google's next Android update.

Xiaomi MIUI 11 Notification Settings

To receive notifications on Xiaomi MIUI 11:

In device Settings > Apps > Permissions > Other Permissions > Aqua Mail > allow the permissions in there.

In device Settings > Apps > Permissions > Autostart > enable Aqua Mail to start automatically.

In device Settings > Apps > Manage apps > Aqua Mail > Notifications > allow the needed notifications in there.

In device Settings > Apps > Manage apps > Aqua Mail > Notifications > Message notifications > enable Show notifications then tap Importance > set to High.

Please check these system level settings carefully in order to have Aqua Mail set properly. Xiaomi's MIUI takes full control of the app's notification scheme.

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